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Ho Sik Kim

The Catholic University of America

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Publication

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Chemistry of Heterocyclic Compounds | 1995

Tautomeric structure of dihiydropyridazino-[3,4-b]quinoxalines in solution and solid state

Yoshihisa Kurasawa; Akiko Takano; Kazuho Harada; Atsushi Takada; Ho Sik Kim; Yoshihisa Okamoto

The reaction of 6-chloro-2-(1-methylhydrazino)quinoxaline 4-oxide (1) with β-diketone abd β-ketoesters gave the dihydropyridazino[3,4-b]quinoxalines (IIIa-d), which were found to exist as the 1,5-dihydro form in solution and solid state by NMR spectoscopy and x-ray analysis.

Journal of Heterocyclic Chemistry | 1998

SYNTHESIS OF PYRAZOLES

Kenzi Makino; Ho Sik Kim; Yoshihisa Kurasawa

Journal of Heterocyclic Chemistry | 1999

SYNTHESIS OF PYRAZOLES AND CONDENSED PYRAZOLES

Kenzi Makino; Ho Sik Kim; Yoshihisa Kurasawa

Journal of Heterocyclic Chemistry | 1998

A new tautomeric zwitterion form of 2-acylamino-4H-1,3,4-oxadiazino[5,6-b]quinoxalines in solution

Yoshihisa Kurasawa; Takako Mitomi; Yoshihisa Okamoto; Ho Sik Kim

Journal of Heterocyclic Chemistry | 1996

Synthesis and evaluation of 1H‐pyrazolo[3,4‐b]quinoxalines and 1‐aryl‐3‐quinoxalinyl‐1,2,4‐triazole as antibacterial agent

Ho Sik Kim; Ju Young Chung; Eun Kyoung Kim; Yong Tae Park; Young Seuk Hong; Man Kil Lee; Yoshihisa Kurasawa; Atsushi Takada

Journal of Heterocyclic Chemistry | 2000

Quinolone analogues 1. A convenient synthesis of 1‐alkyl‐4‐oxo‐1,4‐dihydropyridazino[3,4‐b]quinoxaline‐3‐carboxylic acids

Yoshihisa Kurasawa; Akiko Tsuruoka; Nanae Rikiishi; Noriko Fujiwara; Yoshihisa Okamoto; Ho Sik Kim

Journal of Heterocyclic Chemistry | 2000

Synthesis and conversion of 2-(pyrazol-1-yl)quinoxaline 4-oxides

Ho Sik Kim; Sam Tag Kwag; Kyung Ok Choi; Yoshihisa Okamoto; Shinnosuke Kajiwara; Noriko Fujiwara; Yoshihisa Kurasawa

Journal of Heterocyclic Chemistry | 2000

Quinolone analogues 2. A facile synthesis of novel 3‐substituted 1‐alkyl‐4‐oxo‐1,4‐dihydropyridazino[3,4‐b]quinoxalines

Yoshihisa Kurasawa; Kazunori Sakurai; Shinnosuke Kajiwara; Kazuho Harada; Yoshihisa Okamoto; Ho Sik Kim

Journal of Heterocyclic Chemistry | 1997

Synthesis of novel pyridazino[3,4-b]quinoxalines

Ho Sik Kim; Eun Kyoung Kim; Sung Sik Kim; Yong Tae Park; Young Seuk Hong; Yoshihisa Kurasawa

Journal of Heterocyclic Chemistry | 2003

Quinolone analogues 6 [1‐5]. Synthesis of 3‐halogeno‐1‐methylpyridazino[3,4‐b]quinoxalin‐4(1H)‐ones

Yoshihisa Kurasawa; Waka Satoh; Izumi Matsuzaki; Yuka Maesaki; Yoshihisa Okamoto; Ho Sik Kim

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Yoshihisa Kurasawa

Kitasato University

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Yoshihisa Okamoto

Kitasato University

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Yong Tae Park

The Catholic University of America

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Young Seuk Hong

The Catholic University of America

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Akiko Takano

Kitasato University

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Atsushi Takada

Kitasato University

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Eisuke Kaji

Kitasato University

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Shinnosuke Kajiwara

Kitasato University

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Eun Kyoung Kim

The Catholic University of America

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Geuk Jeong

The Catholic University of America

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